DL provides an efficient service layer that is optimized for running in a multi-
tenant datacenter environment such as Mesos or Yarn. The service layer is able
to support large scale writes (fan-in) and reads (fan-out).

DL has a modern layered architecture design, which separates the stateless
service tier from the stateful storage tier. To support large scale writes (fan-
in) and reads (fan-out), DL allows scaling storage independent of scaling CPU
and memory.